/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

#include "../../Application/jucer_Headers.h"
#include "../../Application/jucer_Application.h"
#include "../jucer_PaintRoutine.h"
#include "../jucer_UtilityFunctions.h"
#include "../UI/jucer_JucerCommandIDs.h"
#include "../UI/jucer_PaintRoutineEditor.h"
#include "../Properties/jucer_PositionPropertyBase.h"
#include "jucer_ElementSiblingComponent.h"
#include "jucer_PaintElementUndoableAction.h"


//==============================================================================
PaintElement::PaintElement (PaintRoutine* owner_,
                            const String& typeName_)
    : borderThickness (4),
      owner (owner_),
      typeName (typeName_),
      selected (false),
      dragging (false),
      originalAspectRatio (1.0)
{
    setRepaintsOnMouseActivity (true);

    position.rect.setWidth (100);
    position.rect.setHeight (100);

    setMinimumOnscreenAmounts (0, 0, 0, 0);
    setSizeLimits (borderThickness * 2 + 1, borderThickness * 2 + 1, 8192, 8192);

    border.reset (new ResizableBorderComponent (this, this));
    addChildComponent (border.get());

    border->setBorderThickness (BorderSize<int> (borderThickness));

    if (owner != nullptr)
        owner->getSelectedElements().addChangeListener (this);

    selfChangeListenerList.addChangeListener (this);
    siblingComponentsChanged();
}

PaintElement::~PaintElement()
{
    siblingComponents.clear();

    if (owner != nullptr)
    {
        owner->getSelectedElements().deselect (this);
        owner->getSelectedElements().removeChangeListener (this);
    }
}


//==============================================================================
void PaintElement::setInitialBounds (int parentWidth, int parentHeight)
{
    RelativePositionedRectangle pr (getPosition());
    pr.rect.setX (parentWidth / 4 + Random::getSystemRandom().nextInt (parentWidth / 4) - parentWidth / 8);
    pr.rect.setY (parentHeight / 3 + Random::getSystemRandom().nextInt (parentHeight / 4) - parentHeight / 8);
    setPosition (pr, false);
}

//==============================================================================
const RelativePositionedRectangle& PaintElement::getPosition() const
{
    return position;
}

class PaintElementMoveAction  : public PaintElementUndoableAction <PaintElement>
{
public:
    PaintElementMoveAction (PaintElement* const element, const RelativePositionedRectangle& newState_)
        : PaintElementUndoableAction <PaintElement> (element),
          newState (newState_),
          oldState (element->getPosition())
    {
    }

    bool perform() override
    {
        showCorrectTab();
        getElement()->setPosition (newState, false);
        return true;
    }

    bool undo() override
    {
        showCorrectTab();
        getElement()->setPosition (oldState, false);
        return true;
    }

    RelativePositionedRectangle newState, oldState;
};

class ChangePaintElementBoundsAction    : public PaintElementUndoableAction <PaintElement>
{
public:
    ChangePaintElementBoundsAction (PaintElement* const element, const Rectangle<int>& bounds)
        : PaintElementUndoableAction <PaintElement> (element),
          newBounds (bounds),
          oldBounds (element->getBounds())
    {
    }

    bool perform() override
    {
        showCorrectTab();
        getElement()->setBounds (newBounds);
        return true;
    }

    bool undo() override
    {
        showCorrectTab();
        getElement()->setBounds (oldBounds);
        return true;
    }

private:
    Rectangle<int> newBounds, oldBounds;
};

class ChangePaintElementBoundsAndPropertiesAction    : public PaintElementUndoableAction <PaintElement>
{
public:
    ChangePaintElementBoundsAndPropertiesAction (PaintElement* const element, const Rectangle<int>& bounds,
                                                 const NamedValueSet& props)
        : PaintElementUndoableAction <PaintElement> (element),
          newBounds (bounds),
          oldBounds (element->getBounds()),
          newProps (props),
          oldProps (element->getProperties())
    {
    }

    bool perform() override
    {
        showCorrectTab();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getElement()->getParentComponent()))
            getElement()->setCurrentBounds (newBounds, pe->getComponentArea(), false);

        getElement()->getProperties() = newProps;
        return true;
    }

    bool undo() override
    {
        showCorrectTab();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getElement()->getParentComponent()))
            getElement()->setCurrentBounds (oldBounds, pe->getComponentArea(), false);

        getElement()->getProperties() = oldProps;
        return true;
    }

private:
    Rectangle<int> newBounds, oldBounds;
    NamedValueSet newProps, oldProps;
};

void PaintElement::setPosition (const RelativePositionedRectangle& newPosition, const bool undoable)
{
    if (position != newPosition)
    {
        if (undoable)
        {
            perform (new PaintElementMoveAction (this, newPosition),
                     "Move " + getTypeName());
        }
        else
        {
            position = newPosition;

            if (owner != nullptr)
                owner->changed();
        }
    }
}

void PaintElement::setPaintElementBounds (const Rectangle<int>& newBounds, const bool undoable)
{
    if (getBounds() != newBounds)
    {
        if (undoable)
        {
            perform (new ChangePaintElementBoundsAction (this, newBounds), "Change paint element bounds");
        }
        else
        {
            setBounds (newBounds);
            changed();
        }
    }
}

void PaintElement::setPaintElementBoundsAndProperties (PaintElement* elementToPosition, const Rectangle<int>& newBounds,
                                                       PaintElement* referenceElement, const bool undoable)
{
    auto props = NamedValueSet (elementToPosition->getProperties());

    auto rect = elementToPosition->getPosition().rect;
    auto referenceElementPosition = referenceElement->getPosition();
    auto referenceElementRect = referenceElementPosition.rect;

    rect.setModes (referenceElementRect.getAnchorPointX(), referenceElementRect.getPositionModeX(),
                   referenceElementRect.getAnchorPointY(), referenceElementRect.getPositionModeY(),
                   referenceElementRect.getWidthMode(),    referenceElementRect.getHeightMode(),
                   elementToPosition->getBounds());

    props.set ("pos",         rect.toString());
    props.set ("relativeToX", String::toHexString (referenceElementPosition.relativeToX));
    props.set ("relativeToY", String::toHexString (referenceElementPosition.relativeToY));
    props.set ("relativeToW", String::toHexString (referenceElementPosition.relativeToW));
    props.set ("relativeToH", String::toHexString (referenceElementPosition.relativeToH));

    if (elementToPosition->getBounds() != newBounds || elementToPosition->getProperties() != props)
    {
        if (undoable)
        {
            perform (new ChangePaintElementBoundsAndPropertiesAction (elementToPosition, newBounds, props),
                     "Change paint element bounds");
        }
        else
        {
            if (auto* pe = dynamic_cast<PaintRoutineEditor*> (elementToPosition->getParentComponent()))
                elementToPosition->setCurrentBounds (newBounds, pe->getComponentArea(), false);

            elementToPosition->getProperties() = props;
            owner->changed();
        }
    }
}

//==============================================================================
Rectangle<int> PaintElement::getCurrentBounds (const Rectangle<int>& parentArea) const
{
    return position.getRectangle (parentArea, getDocument()->getComponentLayout());
}

void PaintElement::setCurrentBounds (const Rectangle<int>& newBounds,
                                     const Rectangle<int>& parentArea,
                                     const bool undoable)
{
    RelativePositionedRectangle pr (position);
    pr.updateFrom (newBounds.getX() - parentArea.getX(),
                   newBounds.getY() - parentArea.getY(),
                   jmax (1, newBounds.getWidth()),
                   jmax (1, newBounds.getHeight()),
                   Rectangle<int> (0, 0, parentArea.getWidth(), parentArea.getHeight()),
                   getDocument()->getComponentLayout());

    setPosition (pr, undoable);

    updateBounds (parentArea);
}

void PaintElement::updateBounds (const Rectangle<int>& parentArea)
{
    if (! parentArea.isEmpty())
    {
        setBounds (getCurrentBounds (parentArea)
                        .expanded (borderThickness,
                                   borderThickness));

        for (int i = siblingComponents.size(); --i >= 0;)
            siblingComponents.getUnchecked (i)->updatePosition();
    }
}

//==============================================================================
class ElementPositionProperty   : public PositionPropertyBase
{
public:
    ElementPositionProperty (PaintElement* e, const String& name,
                             ComponentPositionDimension dimension_)
       : PositionPropertyBase (e, name, dimension_, true, false,
                               e->getDocument()->getComponentLayout()),
         listener (e),
         element (e)
    {
        listener.setPropertyToRefresh (*this);
    }

    void setPosition (const RelativePositionedRectangle& newPos) override
    {
        if (element->getOwner()->getSelectedElements().getNumSelected() > 1)
            positionOtherSelectedElements (getPosition(), newPos);

        listener.owner->setPosition (newPos, true);
    }

    RelativePositionedRectangle getPosition() const override
    {
        return listener.owner->getPosition();
    }

private:
    ElementListener<PaintElement> listener;
    PaintElement* element;

    void positionOtherSelectedElements (const RelativePositionedRectangle& oldPos, const RelativePositionedRectangle& newPos)
    {
        for (auto* s : element->getOwner()->getSelectedElements())
        {
            if (s != element)
            {
                auto currentPos = s->getPosition();
                auto diff = 0.0;

                if (dimension == ComponentPositionDimension::componentX)
                {
                    diff = newPos.rect.getX() - oldPos.rect.getX();
                    currentPos.rect.setX (currentPos.rect.getX() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentY)
                {
                    diff = newPos.rect.getY() - oldPos.rect.getY();
                    currentPos.rect.setY (currentPos.rect.getY() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentWidth)
                {
                    diff = newPos.rect.getWidth() - oldPos.rect.getWidth();
                    currentPos.rect.setWidth (currentPos.rect.getWidth() + diff);
                }
                else if (dimension == ComponentPositionDimension::componentHeight)
                {
                    diff = newPos.rect.getHeight() - oldPos.rect.getHeight();
                    currentPos.rect.setHeight (currentPos.rect.getHeight() + diff);
                }

                s->setPosition (currentPos, true);
            }
        }
    }
};

//==============================================================================
void PaintElement::getEditableProperties (Array <PropertyComponent*>& props, bool multipleSelected)
{
    ignoreUnused (multipleSelected);

    props.add (new ElementPositionProperty (this, "x", PositionPropertyBase::componentX));
    props.add (new ElementPositionProperty (this, "y", PositionPropertyBase::componentY));
    props.add (new ElementPositionProperty (this, "width", PositionPropertyBase::componentWidth));
    props.add (new ElementPositionProperty (this, "height", PositionPropertyBase::componentHeight));
}

//==============================================================================
JucerDocument* PaintElement::getDocument() const
{
    return owner->getDocument();
}

void PaintElement::changed()
{
    repaint();
    owner->changed();
}

bool PaintElement::perform (UndoableAction* action, const String& actionName)
{
    return owner->perform (action, actionName);
}

void PaintElement::parentHierarchyChanged()
{
    updateSiblingComps();
}

//==============================================================================
void PaintElement::drawExtraEditorGraphics (Graphics&, const Rectangle<int>& /*relativeTo*/)
{
}

void PaintElement::paint (Graphics& g)
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
    {
        auto area = pe->getComponentArea();

        g.saveState();
        g.setOrigin (area.getPosition() - Component::getPosition());
        area.setPosition (0, 0);

        g.saveState();
        g.reduceClipRegion (0, 0, area.getWidth(), area.getHeight());

        draw (g, getDocument()->getComponentLayout(), area);

        g.restoreState();

        drawExtraEditorGraphics (g, area);
        g.restoreState();

        if (selected)
        {
            const BorderSize<int> borderSize (border->getBorderThickness());
            auto baseColour = findColour (defaultHighlightColourId);

            drawResizableBorder (g, getWidth(), getHeight(), borderSize,
                                 (isMouseOverOrDragging() || border->isMouseOverOrDragging()),
                                 baseColour.withAlpha (owner->getSelectedElements().getSelectedItem (0) == this ? 1.0f : 0.3f));
        }
        else if (isMouseOverOrDragging())
        {
            drawMouseOverCorners (g, getWidth(), getHeight());
        }
    }
}

void PaintElement::resized()
{
    border->setBounds (getLocalBounds());
}

void PaintElement::mouseDown (const MouseEvent& e)
{
    dragging = false;

    if (owner != nullptr)
    {
        owner->getSelectedPoints().deselectAll();
        mouseDownSelectStatus = owner->getSelectedElements().addToSelectionOnMouseDown (this, e.mods);
    }

    if (e.mods.isPopupMenu())
    {
        showPopupMenu();
        return; // this may be deleted now..
    }
}

void PaintElement::mouseDrag (const MouseEvent& e)
{
    if (! e.mods.isPopupMenu())
    {
        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        {
            auto area = pe->getComponentArea();

            if (selected && ! dragging)
            {
                dragging = e.mouseWasDraggedSinceMouseDown();

                if (dragging)
                    owner->startDragging (area);
            }

            if (dragging)
                owner->dragSelectedComps (e.getDistanceFromDragStartX(),
                                          e.getDistanceFromDragStartY(),
                                          area);
        }
    }
}

void PaintElement::mouseUp (const MouseEvent& e)
{
    if (owner != nullptr)
    {
        if (dragging)
            owner->endDragging();

        if (owner != nullptr)
            owner->getSelectedElements().addToSelectionOnMouseUp (this, e.mods, dragging, mouseDownSelectStatus);
    }
}

void PaintElement::resizeStart()
{
    if (getHeight() > 0)
        originalAspectRatio = getWidth() / (double) getHeight();
    else
        originalAspectRatio = 1.0;
}

void PaintElement::resizeEnd()
{
}

void PaintElement::checkBounds (Rectangle<int>& b,
                                const Rectangle<int>& previousBounds,
                                const Rectangle<int>& limits,
                                const bool isStretchingTop,
                                const bool isStretchingLeft,
                                const bool isStretchingBottom,
                                const bool isStretchingRight)
{
    if (ModifierKeys::currentModifiers.isShiftDown())
        setFixedAspectRatio (originalAspectRatio);
    else
        setFixedAspectRatio (0.0);

    ComponentBoundsConstrainer::checkBounds (b, previousBounds, limits, isStretchingTop, isStretchingLeft, isStretchingBottom, isStretchingRight);

    if (auto* document = getDocument())
    {
        if (document->isSnapActive (true))
        {
            if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
            {
                auto area = pe->getComponentArea();

                int x = b.getX();
                int y = b.getY();
                int w = b.getWidth();
                int h = b.getHeight();

                x += borderThickness - area.getX();
                y += borderThickness - area.getY();
                w -= borderThickness * 2;
                h -= borderThickness * 2;

                int right = x + w;
                int bottom = y + h;

                if (isStretchingRight)
                    right = document->snapPosition (right);

                if (isStretchingBottom)
                    bottom = document->snapPosition (bottom);

                if (isStretchingLeft)
                    x = document->snapPosition (x);

                if (isStretchingTop)
                    y = document->snapPosition (y);

                w = (right - x) + borderThickness * 2;
                h = (bottom - y) + borderThickness * 2;
                x -= borderThickness - area.getX();
                y -= borderThickness - area.getY();

                b = { x, y, w, h };
            }
        }
    }
}

void PaintElement::applyBoundsToComponent (Component&, Rectangle<int> newBounds)
{
    if (getBounds() != newBounds)
    {
        getDocument()->getUndoManager().undoCurrentTransactionOnly();

        auto dX = newBounds.getX() - getX();
        auto dY = newBounds.getY() - getY();
        auto dW = newBounds.getWidth() - getWidth();
        auto dH = newBounds.getHeight() - getHeight();

        if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
            setCurrentBounds (newBounds.expanded (-borderThickness, -borderThickness),
                              pe->getComponentArea(), true);

        if (owner->getSelectedElements().getNumSelected() > 1)
        {
            for (auto selectedElement : owner->getSelectedElements())
            {
                if (selectedElement != nullptr && selectedElement != this)
                {
                    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (selectedElement->getParentComponent()))
                    {
                        Rectangle<int> r { selectedElement->getX() + dX, selectedElement->getY() + dY,
                                           selectedElement->getWidth() + dW, selectedElement->getHeight() + dH };

                        selectedElement->setCurrentBounds (r.expanded (-borderThickness, -borderThickness),
                                                           pe->getComponentArea(), true);
                    }
                }
            }
        }
    }
}

Rectangle<int> PaintElement::getCurrentAbsoluteBounds() const
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        return position.getRectangle (pe->getComponentArea(), getDocument()->getComponentLayout());

    return {};
}

void PaintElement::getCurrentAbsoluteBoundsDouble (double& x, double& y, double& w, double& h) const
{
    if (auto* pe = dynamic_cast<PaintRoutineEditor*> (getParentComponent()))
        position.getRectangleDouble (x, y, w, h, pe->getComponentArea(), getDocument()->getComponentLayout());
}

void PaintElement::changeListenerCallback (ChangeBroadcaster*)
{
    const bool nowSelected = owner != nullptr && owner->getSelectedElements().isSelected (this);

    if (selected != nowSelected)
    {
        selected = nowSelected;
        border->setVisible (nowSelected);
        repaint();

        selectionChanged (nowSelected);
    }

    updateSiblingComps();
}

void PaintElement::selectionChanged (const bool /*isSelected*/)
{
}

void PaintElement::createSiblingComponents()
{
}

void PaintElement::siblingComponentsChanged()
{
    siblingComponents.clear();
    selfChangeListenerList.sendChangeMessage();
}

void PaintElement::updateSiblingComps()
{
    if (selected && getParentComponent() != nullptr && owner->getSelectedElements().getNumSelected() == 1)
    {
        if (siblingComponents.size() == 0)
            createSiblingComponents();

        for (int i = siblingComponents.size(); --i >= 0;)
            siblingComponents.getUnchecked (i)->updatePosition();
    }
    else
    {
        siblingComponents.clear();
    }
}

void PaintElement::showPopupMenu()
{
    auto* commandManager = &ProjucerApplication::getCommandManager();

    PopupMenu m;

    m.addCommandItem (commandManager, JucerCommandIDs::toFront);
    m.addCommandItem (commandManager, JucerCommandIDs::toBack);
    m.addSeparator();

    if (owner != nullptr && owner->getSelectedElements().getNumSelected() > 1)
    {
        m.addCommandItem (commandManager, JucerCommandIDs::alignTop);
        m.addCommandItem (commandManager, JucerCommandIDs::alignRight);
        m.addCommandItem (commandManager, JucerCommandIDs::alignBottom);
        m.addCommandItem (commandManager, JucerCommandIDs::alignLeft);
        m.addSeparator();
    }

    m.addCommandItem (commandManager, StandardApplicationCommandIDs::cut);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::copy);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::paste);
    m.addCommandItem (commandManager, StandardApplicationCommandIDs::del);

    m.showMenuAsync ({});
}
